If this is your first visit, be sure to
check out the FAQ by clicking the
link above. You may have to register
before you can post: click the register link above to proceed. To start viewing messages,
select the forum that you want to visit from the selection below.

Clean the throttle body opening around the butterfly area and clean the idle air by pass valve real well, use choke and carburetor cleaner or throttle body cleaner, (If it still acts up after that replace the idle air bypass valve only use OEM ford part if possible.

start idle issue .

Unplug the tube going to IAC, hold you hand over the inlet to the IAC and see if it still idles.
Sounds like you have a large vacuum leak to me. It revs high because of the leak then the computer is trying to slow the idle by closing the IAC as much as it can. The rough idle is because the air is getting sucked in the intake after the MAF and itís not being metered. How about the tube on the bottom of the turkey pan? They are prone to failing.
Have a boost/vac gauge on the truck?